Malicious PDF — malware analysis report

Static analysis result for SHA-256 b194fe2f0ea29b62…

MALICIOUS

PDF

101.1 KB Created: 2021-06-13 22:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b1a41bf720f737fa8f045f3bade27418 SHA-1: a3afa2779f23123c65cdea6fdd7d054d278baa3f SHA-256: b194fe2f0ea29b62c12cbb15d32152bd6abd10c1e470c813657e687c0df3e0c5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=hwarang+full+episode+tagalog PDF link annotation
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078853e68986---diwewireloli.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9c3a11aeeaca8432f41fc1978d736143/28839645280.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817b431fdaa---71684561413.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/wukizuzaluzanatuzezubobuj.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/43597834559.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fe7f6e857---24312662040.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/ef1a02c14556ddbec5b182e337d862b0/gorades.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/d49527942620d493851f2c617fa64ca4/36738449928.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b5d7d8c14832c41b744bc4014524c613/gopolewafasuz.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b46799b659d---21564396681.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/70467074410.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081b97606427---vagopanasimipafujukam.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/62328929329.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/eeb683c9f3032f22bd1a04a2cfe55ffe/jilexegelib.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/cf3726607eae924547ff1881eac702dd/fulizujazogodagot.pdfIn PDF document text
    • https://ka-base.no/images_content/file/99959639758.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a28213b1240---taxalakafufewudipolafatoz.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/1461734302.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 20840 bytes
SHA-256: 5bfab7238ec8268b612d1a99ef2b1a4b9f43bebbda40b0c5d0c3c7ff415e5edc
font_01_sfnt_off00014e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E21 5260 bytes
SHA-256: d9d025a34c96e6793e7e9caf1bb1fe04254d6d3110a5ceb3df24a7e62b28754c
font_02_sfnt_off0001602b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1602B 11604 bytes
SHA-256: 865cdb515265c6cea13cee59c6e9d27df8007065ae7b4e96f3b789a97e96027c